#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

int main(int argc,char **argv)
{
	int fd;

	if(argc < 2)
	{
		fprintf(stderr,"Usage...\n");
		exit(1);
	}


	fd = open(argv[1],O_WRONLY|O_CREAT|O_TRUNC,0600);
	if(fd < 0)
	{
		perror("open()");
		exit(1);
	}

	lseek(fd,5LL*1024LL*1024LL*1024LL-1LL,SEEK_SET);
	write(fd,"",1);	

	close(fd);

	exit(0);
}


